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\bibitem{Matulis_etal2012} {\textquotedblleft}\textit{Scattering of a Dirac electron on a mass barrier}{\textquotedblright}. Matulis A, Masir MR, Peeters FM, Physical review : A : atomic, molecular and optical physics \textbf{86}, 022101 (2012).   http://doi.org/10.1103/PhysRevA.86.022101

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